1. State
Key Lab of Superhard Materials, Jilin University, Changchun 130012, China
2. College
of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, China
3. College
of Chemistry and Materials Science, Nanjing Normal University, Nanjing, Jiangsu 210023, China
4. Geophysical
Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United States
5. Department
of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan 00931, Puerto Rico